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W; C/u AJAX/ v r W re LI 18S 0/ 1/ [CE NT] v UN ITED STATES PATENT OFFICE.

FRANZ J URSGHINA, OF VIENNA, AUSTRIA-HUNGARY, ASSIGNOR OF OXF- HALF TO FRANZ KAMMANN, OF'SAME PLACE.

SELF-HARDENING CEMENT.

SPECIFICATION forming part of Letters Patent No. 379,580. dated March 20, 1888.

Application filed November 4, 1887. Serial No. 25430111 (No specimens.) Patented in France January 25, 1FS7,No.1S1,121 in England January 27,1957, No.1,330, and in Austria-Hungary December 19, 1837, No. 29,838 and No. 57,351.

, To all whom, it may concern: run into molds or over engraved or otherwise 0 Be it known thatl, FRANZJl'RSUl-IIXA, asnbornamented fiat surfaces for reproduction, s'aid jcctof the EmperorofAnstria-Hn ngary, residcomposition setting and hardening very rapingatVienna,intheProvinceofLower-Austria, idly, and on drying assuming a more or less 5 in the Empire of Austria Hungary, have instony 1d porous nature. This latter propventeda'certainnewand useful Composition of crt'yis iiiiiiiToi tantone'wlienthecomposirion Matter, (for which Letters Patent have been is to be used for the purposeof printing. as it obtained in Austria-Hungary, dated December will retain the ink well; and to this end, type 19, 1887, No. 29,838 and No. 57,381; in France, ornamental borders or ornamental or other de- 10 dated Januam 25, 1887, No. 181,121, and in signs may be obtained from engraved plates,

England, dated January 27. 1887, No. 1,330,) or otherwise produced on or in the material ,0 and I do hereby declare the following to be a while in a plastic condition, from which imi'nll, clear, and exact description of the invenpressions can be obtained.

' tion, such as will enable others skilled in the \Vhen used in a more or less liuid state, the .1 art to which it appertains to make and use the most delicate works of art can be reproduced,

same. as the composition penetrates readily into the 55 This invention relates to and consists 'in a finest lines or readilysurronmls the most delinovel self-hardening composition or cement, oate reliefs, so that. objects of art can be readily consisting, essentially, of tinclvround uartz reproduced with great fidelity.

g0 (silica) and waterlass, nssmm or S()( mm Under some conditions of use Ladd to the silicate) or ement-s com )met silicafinely powdered hydrnuliceement, which 60* V Ortiitllt or other hydraulic cement. is intimatcly iiiiiied therewith before adding e o nee 0 us inven '1011 is o producea the solution of waterglass. The proportion self setting and hardening compound adapted of hydraulic e'einent may be varied, as will be for use in molding, reproducing the similes of readily understood.

objects of art, and other nn-poses-as, for in- Having thus fully described my invention, 6 stance, for purposes of printing. what I claim as new, and desire to secure by In carrying; out the invention the silica is Letters Patent, isground to a tine powder, the fineness depend- Theherein described COlllllOSlilOll of matter,

ing upon the uses made of the cement or comconsisting of silica and water-glass-i. (2., so-

position, as it is obvious that the more delidinm or potassium silicate-to which my hy- 7o cate the objects to be reproduced or molded draulic cementnmy be added, substantially as the finer should be the silica. The pulverized and for the purpose specified. silica may then be converted into a cement, or In testimony whereof I affix my signature in self setting and hardening and more or less presence of two witnesses.

fluid composition, or into a plastic paste, by FRANZ J URSCHIN A. the addition. thereto of a solution of water- Witnesses:

; glass-z. e., potassium or sodium silicate. The EDMUND JUssEN,

more or less fluid composition may then be OT'ro SCHIFFER.

It is hereby certified that in Letters Patent No. 379,580, granted March 20, 1888, upon the application of Franz J urschina, of 'Vienna, Austria-Hungary, for an improvement in Self-Hardening Cement, an error appears in the printed specification requiring correction, as follows: In line 70, the Word my should be stricken out, and that the Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed, countersigned, and sealed this 27th day of March, A. D. 1888.

[SEAL] D. L. HAWKINS,

Assistant Secretary of the Interior.

Oountersigned BENTON J. HALL,

Commissioner of Patents. 

